Weighing scale



Jan. 31, 1933. A. PoLLAK 1,895,863

WEIGHING SCALE A. POLLAK WE IGHING SCALE 4 Sheets-Sheet 2 Jan. 31, 1933.

Filed Aug. so, 1930 v1/@44 @a l Ill v u 1 E ,2f/E @I ,f l 1| I Y f 16" 29 "E @pl Q52 "ill A. POLLAK WEIGHING SCALE Jan. 31", 1933.

4 Sheets-Sheet 3 Filed Aug. 30, 1930 ATTORNEY A. POLLAK WEIGHING SCALE Jan. 31, 1933.

Filed Aug. 30, 1930 4 Sheets-Sheet 4 ATTORN EYS Patented Jan. 3l, 1933 UNITED STATES PATENT OFFICE ABRAHAM IOLLAK, OF FAR ROCKAWAY, NEW YORK WEIGHING SCALE Application led August 30,'139. Serial No. 478,822.

This invention relates to improvements in for adjustment between the helicoidal transweighing scales and particularly to a simplimission element andthe wei hing beam fied scale construction for use in bathrooms whereby final adjustment may e made beand the like for weighing persons. tween the indicating element and the dial to Objects of this invention are to produce a enable the setting of the indicating element 55 scale in which 'mechanism is employed and at zero independent-ly of any adjustment of parts are so arranged so as to cause the height the weight-balancing spring and without the of the platform above the door to be reduced use of a compensating spring; to provide a and to enable a platform to be disposed so scale having a s stemy of levers and a plat- 10 closely to the floor as'to minimize danger of form so arrange and mounted as to provide 60 injur due to slipping off the platform du'ran interlocking connection between said ing t e weighing operation; in which an 1nlevers and the rame and to enable the comdicating element is movable over a graduated plete fastening of all parts by a single fastendial preferably disposed in ahorizontal plane lng element between the platform and one of 15 and the vertical movement of the weighing said levers.

beam will be directly and positively trans- With these and other objects in view, the mitted thereto without the use of toothed invention comprises the combination of memgears and the like; in whichtwo members, one bers and arrangement of parts so combined beingahelicoidal member mounted for moveas to co-act and cooperate with each` other ment about a vertical axis and the other in the performance of the functions and the 70 mounted for movement in a vertical plane accomplishment of the results herein conwill have direct meshing engagement to templated, and comprises in one of its adaptransmit the movement of one to the other and tations the species or preferred form illuspreferably to convert the vertical movement trated in the accompanying drawings, in

' of a weighing beam to horizontal movement which of an indicating element; in which a heh- Flg. l 1s a plan view of a scale embodycoidal element or s iral is mounted to exing my invention; tend vertically at tlie axis of the dial and Fig. '2 is a vertical section on the line 2--2 utilized asa transmission element and is of Fig. l, looking in the direction of the ar- 9 directly connected with said indicating elerow, with the weighing spring and cooperat- 8 ment; and in which said helicoidal element ing parts shown in side elevation;

cooperates with a nut or sleeve movable ver- Fig. 3 is a view, in plan, of the springl tically in a rectilinear line by weighing beam column with the dial removed;

to turn the helicoidal element or spiral and Fig. 4 is an enlarged vertical centralsection to transmit such movement directly to inon the line 2-2 of Fig. l, looking in the direc- 85 dicating element without the interposition of tion of the arrow, through the column and gears or the like; in which movement of the through the spring as shown in Fig. 2;

weighing beam and the size of the s'cale parts Fig. 5 is a section on the line 5-5 of Fig.

may be reduced and said-reduced movement 4, looking in the direction of the arrow;

of the weighing beam will be sufficient when Fig. 6 isa section on the line 6 6 of Fig. 90

transmitted to an indicator to move the same 4, looking in the direction of the arrow;

over the dial; to provide a scale construc- Fig. 7 is an inverted view, in plan, of the tion in which lost motion in the indicator scale;

actuating mechanism is eliminated, thus Fig. 8 is a section on the line 8-8 of Figs.

avoiding inaccuracies in the scale due to lost l and 7- respectively; 95

motion; to provide a scale of the type having Fig. 9 is a section on the line 9 9 of Fig.

a spring as the weight-balancing element 1, looking in the direction of the arrow;

with means for providing read and quick Fig. 10 is a section on the line 10--10 of adjustment of said'spring in re ation to the Fig. 2, looking in the direction of the arload and graduated dial; to provide means row; and

Fig. 11 is a section on the line 11-11 of l'riig. 9, looking in the direction of the arrow.

Referring now to these drawings, which illustrate a preferred embodiment of my invention, 1 indicates a base member or cast ing rectangular in conformation provided at its corners with four feet 2 and having at its upperedge a horizontally-disposed marginal flange 1' interrupted at the front of the base member to permit the provision of an integral dial column 3. The said base member 1 is provided at each corner with integrally-formed brackets 4 having one member of a knife-edge bearings, which, as shown, comprises knife-edge bearing-notches 4 arrangedy adjacent and beneath notches 1a in the flange 1.', thus enabling the entrance and interlocking with the knife-edge bearing notches of knife-edge pivot members formed on a system of levers. As illustrated, l provide a pair of levers 5 and 6, each triangular in conformation having adjacent to the baseangl'es knife edge pivot members 7 adapted to be slipped into and interlock with the knife-edge notches 4 of the bracket 4 and each of said pivot members is provided with Va. pin 7' capable of forming an interlocking v connection beneath the flange 1. These levers are arranged, except for the interlocking connection with the base, in substantially conventional form, the front lever being arranged to extend above the rear lever and one of said levers being arranged to cross and to have a swinging connection with the other at a central point. As shown, the lever 5 is provided with an opening 5 and the lever 6 is provided With a depending notched element 6 which rests upon a wire loop 8 suspended from notches 5a in the lever 5. Any weight imposed upon the lever 6 will thus be transmitted to the lever 5 and to a weighing ,arm 5b which is formed integrally therewith. Said weighing arm 5b has at its outer end a bifurcated front end or fork 5c which is con- -nected through knife-edge. bearings with a cylindrical spring-mounting head 9, the fork 5 being provided at each side with one element of a lmife-edge bearing and the other knife-edge bearing element being provided on the spring-mounting head 9. As illus trated, the fork is provided with knife-edge bearing notches 5d and the spring-mounting head is provided with the knife-edge pivot members 9'; The cylindrical spring-mount-- ing head 9 has a connection with the-lower end of a weight-balancing spring 10 which is capable of fine screw-threaded adjustment while the spring and head are connected and mounted in the scale and without any rotation of the spring or of that portion of the head having the knife-edge bearing members mounted thereon. To accomplish this object, the spring-mounting head is formed in @5 two parts, one of which comprises a double- Lseaeee threaded rotatable auxiliary mounting-sleeve member 9a which has an internal spiral or thread .9b connected with the spring 10 and an external thread 9 connected with an internal thread 9d on the non-rotatable primary member 9 which is provided with a set-screw 1l engageable with the thread of the auxiliary sleeve member to lock the parts together in any suitable adjusted relationship.

Said spring 11 is supported at its end at the head or top '3' of the column 3 and, as illustrated, said opposite end is preferably partially connected by threading the spirals thereof into an axial or central internallythreaded hole or opening 12 in the said head to receive the same. The upper end of the spring 11 is passed through said opening` 12 in the horizontally-disposed head 3 of the column 3 which at said upper end isprovided with an enlarged depression or chamber 14 in which an upper coil 1()a of the spring seats. The edge of said head 3 is'also provided with a notch 13' within which the end 10b of the spring 10 is fastened.

The platform is supported on the system of levers in a substantially conventional manner. The base-arm 5e of .the rear lever 5 is provided with a pair of knife-edge pivot members 15 and the forward ends of the lever 6 are provided witha pair ofknife-edge pivot members 16 all of which, as shown, are formed integrally with the said lever members on the upper surfaces thereof. The rear end of the platform 17 is provided Vwith a pair of notched bearing elements 18, each having a knife-edge bearing or notch 18 bearing upon the rear knife-edge pivot members 15. The platform 17 is also provided with front knife-edge bearing'members 181having bearing notches 18b which contact with knife-edge pivot members 19 on an intermediate sleeve 19 which is also provided with a knife-edge bearing notch 19a contacting with the knife-edge pivot members 16 on the lever 6. The kmfe-edge pivot members 16 are formed on a hub 6l and the sleeve is held on the hub by a washer Gb-and screw 6c.

The platform will thus be supported to transmit any weight superimposed thereon to the system of levers which will, in turn, transmit the same to the weighing beam or arm 5b, the other end of which is supported on a weight-resisting or balancing spring 10 so mounted that any weight on the platform will expand or stretch the same in proportion to the amount of weight superimposed upon the platform.

It is desirable that all the parts of the scale be capable of ready and quick assembly and disassembly and that they may be interlocked without affecting the operation of the nect and lock all the partsof the scale tother. For this urpose an'arm 5 of the ever 5`is provided) with an elongated opening 5' and the platform 17 'is provided with a downward projection 17 which extends throu h the elongated opening 5' and is provided eneath the lever with a washer 17 a and a cotter pin 17 b is passed through a hole in the rejection 17 The platform is thus securely fastened to the levers and the levers being, as hereinabove described, interlocked with the base member or casting 1, all the parts will be capable of ready and nick assembly and disassembly, it beingpun erstood that by the removal of the cotter pin 20, the platform may be lifted and the levers 5 and 6 will then be accessible for removal, if desired. l

An important feature of my invention comprises my novel indicator-movingv mechanism, which I will now describe:

I dispose a dial 2O of the scale in horizontal position, an indicator 21 is movable in a horizontal plane over the dial and the vertical movement of the Weighing beam is converted directly into horizontal movement for the indicator 21 without the use of gears or like elements. It is also desirable to move this indicator without lost motion; also'. to provide means which will enable a relatlve short rectilinear movement of the scale beam to produce a complete turnin of the indicator and which, with a reduce or minimum of vertical movement will enable complete revolution of the indicator, tlus enabling the height of the dial column and the required movement of the weighing beam to be reduced, and I am enabled to accomplish these objects by the use of extremely simple mechanlsm which is not likely to get out of order and which ma be readily adjusted independently of the ba ancing spring and without any compensating sprin to provide a setting movement of the in icating element at zero, whereby the adjustment of the balancin sprin in relation to the weightv may be accompished independently of the setting of the indicating element to zero and v1ce versa.

In the preferred embodiment of my invention illustrated, the head 3' of the column is provided with a dial plate 21' fastened to the head 3 by screws 22 and having an axial bearing 23 having 'at the upper and `lower end thereof ballb'earing grooves 23', 23 provided with balls 24 and I mount Within this bearing 23 a shaft 25 having at its lower end a helicoidal member or spiral 26, the wings or threads 26 of which are passed through and mesh with a sleeve or nut 27. As shown, this is accomplished by utilizing a flat wing spiral and passing the wing thereof through a hole -27 in the nut or sleeve 27 which is formed integrally with a flat semi-resilient connecting rod or member 28 disposed in a plane parallel to the hole 27 and mounted at its lower end on a projection 29 connected to the weighing arm or beam 5. The corner edges 27*` of the hole 27' are normally maintamed in contact with a surface of the wing by providing a bend 28 in the integral connecting element 28. The said element 28 is mounted to permit vertical adjustment in relation to the weighing beam or arm 5" and the spiral 26 so as to permit the indicating element actuated bv the turning of said spiral to be set independently of the adjustment of the balancing spring l10 and without the use of any compensating s ring or like element. To account for such adjustment, the end 28b of the connecting member 28 is provided with a bore 28c which is mounted upon an adjusting eccentric 29 which is mounted in a head 29 and formed integrally with a rod 30 mounted in a bearing aperture 31 in the arm 5" and preferably retained against accidental movement by a spring 32 compressed by a nut 33 on the threaded end 30 of the rod 30 and locked bv a vlock-nut 34. The rod 30 is provided with a forward extension 30* having a flattened end 30" adapted to be grasped by the fingers of the user and turned so as to swing the eccentric about the axis of the rod. Such swinging will obviously cause a vertical movement of the sleeve or nut in relation to the spiral which will thus cause a turning of the shaft 25 and will thus enable a setting of the indicator in relation to the graduations on the dial. I am thus enabled, as above-mentioned, to provide setting adjustment independently of the adjustment of the balancing spring and to accomplish such adjustment without the use of compensat` in springs or the like.

aving described my invention, I claim 1. A weighing scale embodying, in combination, a load-receiving platform, a weighing-beam movable up and down in a vertical plane, weight-balancing means, aV graduated dial, a weight-indicating element movable in g a horizontal plane over said dial, and means for converting the vertical movement of said weighing beam into the horizontal movement of the indicating element comprising a helicoidal member disposed in a vertical plane and another member engageable with and movable vertically relatively to said helicoi dal member, one of said members being connected with the said indicating element and the other with the weighing beam to convert the vertical movement of the weighing beam into horizontal movement for said indicating element.

2. A weighing scale embodying, in Vcombination, a load-receiving platform, a weighing-beam movable up and down in a vertical glane, weight-balancing means, a graduated ial, a weight-indicating element movable in a horizontal plane over said dial, and means for converting the vertical movement of said' weighing beam into the horizontal movement 5 thread, and an actuating bination, a load-receiving plat for the indicating element comprising a member connected to the indicating element, said member being mounted for rotation about a. vertical axis and having a helicoidal member having a meshing engagement with the said thread of said helicoidal member, and connected to said weighing-beam for movement therewith in a vertical plane only.

3. A weighing scale embod 'ng, in comorm, a weighing beam movable up and down in a vertical plane, weight-balancing means, a graduated dial, a weight-indicating element movable in 4. A weig ngscale embodying, in combination, a load-receiving platform, a weighing beam movable up and down in a vertical plane, a weight-balancing spiral spring, a graduated dial, a vweight-indicating element movable in a horizontal plane over said dial` and means for converting the vertical movement of said weighing beam into the horizontal movement of the indicating element comprising a helicoidal member disposed 1n a vertical plane axially within said spring and another member -engageable with and movable vertically relatively to said helicoidal member, one of said members being connected with the said indicating element and the other with the weighing beam to convert the vertical movement of the weighing beam into horizontal movement for said indicating element.

5. A Weighing scale embodying, in combination, a load-receiving platform, a wei hing-beam movable up and down in a vertical plane, a weight-balancing spiral spring, a. graduated dial, a weight-indicating element movable in a horizontal plane over said dial, and means for converting the vertical movement of said weighing beam into the horizontal movement for the indicating element comprising a member connected to the indicating element, said member being mounted for rotation about a vertical axis within said spring and having a helicoidal thread, and an actuating memberV having a meshing engagement with the said 65 thread of said helicoidal member and conaaaaeea nected to said weighing-beam for movementand having a iat wing-thread, and an actuat- Y ing sleeve having a meshing engagement with the said iiat wing-thread of said spiral and having a connection to said weighing-beam for movement therewith in a vertical plane only, said actuating member being arranged.

to maintain contact with one surface of the thread of said spiral during the downward movement of said actuating member.

7. A weighing scale embodying, in combination, a load-receiving platform, a weighing beam movable up and down in a vertical plane, a graduated dial, weight-indicating means actuated by said weighing beam, a weight-balancing spiral spring, means for l tixedly supporting said spring atits upper end and adjustable connecting means for connecting the lower end of said spring to said weighing beam comprising a non-rotatable element having a connection with said weighing beam and a rotatable member having a thread connection with said spring and with said non-rotatable member.

8. A weighing scale embodying, in combination, a base member and provided with one element of a knife-edge bearing, a pair of levers, each having knifeedge bearing elements adapted to cooperate with the bearing members on the base member and having means for providing a releasable interlocking connection with the said base member, said levers also having additional knifeedge bearing members extending upwardly, a platform having knife-edge bearing elements supported on the knife-edge elements of the levers, and means for fastening the platform to the levers to fasten the base mem- 115 ber, levers and platform together.

In witness whereof, I have signed my name to the foregoing specification.

AB POLLAK. 

